<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>查找是否存在</title>
</head>
<body>
  <!-- 请补全JavaScript函数，要求以boolean的形式返回字符串首参中是否包含第二个参数。 -->
<script>
  function _search(string,value) {
    // 补全代码
    return string.includes(value)
}
</script>
</body>
</html>